Malicious PDF — malware analysis report

Static analysis result for SHA-256 66d40b070e6e3983…

MALICIOUS

PDF

70.1 KB Created: 2021-09-27 21:30:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 85708263825b998a10d8d040584b07b5 SHA-1: 6f26b4f539dcd4b2d31a7187e79fd13bdd471e35 SHA-256: 66d40b070e6e39831fb80c798e5f6aa1fc45e510c7ec0a36249e45edbb2ee1ad
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://drafthe.ru/uplcv?utm_term=psn+codes+list PDF link annotation
    • https://chaletsuenodesol.de/files/nupalukeb.pdfIn PDF document text
    • https://www.sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/ninefuxamujusalijuzuvoda.pdfIn PDF document text
    • http://arabic.cz/ckfinder/userfiles/files/wenanogijokixirenezota.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/zififilokorovuvulipuz.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16142b60c79099---nanusajarer.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16140e61f7e909---14206981353.pdfIn PDF document text
    • http://020tzs.com/baige/images/userfiles/file/sabosuloponewupex.pdfIn PDF document text
    • https://adproissy.emailingmanager.com/uploads/editor/file/pinetenap.pdfIn PDF document text
    • http://gamax-moto.cz/data/dokumenty/94206104137.pdfIn PDF document text
    • http://goozzl.com/userfiles/files/19294155309.pdfIn PDF document text
    • https://hainutedecopii.eu/ckfinder/userfiles/files/nazafuborokoziduna.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614224db05dd8---37971955307.pdfIn PDF document text
    • http://chandravanshi.com/userfiles/file/93625799137.pdfIn PDF document text
    • http://mcdanielz.eu/files/file/legasexelojedijowuvinajo.pdfIn PDF document text
    • http://redigonda.it/userfiles/files/87628804876.pdfIn PDF document text
    • https://shastriratanchatterjee.com/ckfinder/userfiles/files/3185758706.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/85ulmu4ud404i2m7afidlbei8h/kaguzo.pdfIn PDF document text
    • https://n-vv.dk/userfiles/file/5218841954.pdfIn PDF document text
    • http://gzperson.com/uploadfile/files/22603824220.pdfIn PDF document text
    • http://atreve.eu/ubezpiecz/obrazy/file/91118667534.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/18644415640.pdfIn PDF document text
    • http://distant-property.ru/fck_editor_files/files/gitulufipumase.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/funovidivuzutes.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000af52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF52 17608 bytes
SHA-256: fb63c5a61336b7c3c661e5fafc0a5fa06e8f9676dc7074d555ce87ed1d3e3500
font_01_sfnt_off0000dcc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC3 10104 bytes
SHA-256: 9346b87513fa75d4828165b5125a6f5f48558523cc4f1816ff72024e6330791d
font_02_sfnt_off0000f360.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF360 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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